Suction cleaner



Sept. 20, 1932.

W. H. KITTO SUCTION CLEANER Filed May 5, 1930 Patented Sept. 20, 1932 UNITED STATES PATENT OFI-lcs WILLIAM H. KITTO, OF CANTON, OHIO, ASSIGNOB T THE HOOVER COMPANYQiOF.

' NORTH CANTON, OHIO, A CORPORATION OF OHIO S'O'OTION CLEANER ApplmatnmV mea may 5, 1980. serial No. 445,778. v

' The present invention relates to suction cleaners and particularly to that type of la suction cleaner in which the driving motor for the suction-creating fan is positioned within, andentirely enclosed by, a main cas# ing which defines the exhaust outlet from the fan chamber and to which the dirt separator is attached. More specifically the invention relates to improvements in means for cooling a suction cleaner motor in that type of suction cleaner in which vthe motor casing is entirely surrounded by the discharge passageway leading from the fan chamber.

In suction cleaners of the aforementioned J5 type reliance is often had solely upon radiation through the motor casing to the dirtladen air which passes in the surrounding air passageway for motor cooling -but it is the teaching of` experience that in the high speed motor used in this type of machine that this radiation is not adequate to maintain a suiiiciently cool motor for efiiciencyand long life and for that reason it is necessary to provide additional means for cooling as by 26 passing cooling air directly through the motor. Use cannot be made of the air which encloses the motor casing and which carries the dirt and other foreign susbtances which has been removed from the covering undergoing cleaning as the passage of schair through the motor proper' would result in injury thereto such as fouling of thebearings, increased wear of the commutator brushes, and the injury to the commutator itself. In a suction cleaner of the type under consideration the present invention -provides means by which cooling air-is drawn from outside of the main casinginto themotor 'casing and is exhausted therefrom into the dirt-laden air stream after having passed through the motor to perform its cooling function.

In the drawing in which a preferred embodiment of the present invention is dis'- closed:

AFig.

1 is a side elevation, with certain parts'broken away, of a preferred embodi-V ment' ofthe present invention,

Fig. 2 is an enlarged sect1 portant elementof the preseniI invention,

motor is' suitably mounted within the casing on of an the arr passageway to the end of the motor 10o In the drawing a suction cleaner is disclosed which comprises a body or casing 1 which includes the nozzle proper 2, the 'fan chamber 3, and an enclosing casing 4, which forms the discharge' passageway from the 55 fan chamber 3 which is 'of the type which discharges rearwardly adjacent its entire periphery. A dirt separator or dust bag 5 is secured to the rear of the enclosing casing 4 by suitable means such as 6 and serves to remove the suspended foreign matter from` the cleaning air which is discharged thereinto. A handle 7 is provided which is'con-. nected to the casing 4 and fan'c'hamber'3, which provides means by which vthe cleaner may be manipulated by the operator. 'A switch 8 is suitably positioned upon the handle 7 and is electrically connected to the source of electrical power which 'enters through the wire 9 at a convenient place in` the rear'of handle 7 and is continued and makes electrical contact with the driving.

motor to be hereinafter described.

Positioned within the casing 4 'of the cleaner is a totally enclosed motorv which is indicated generally by the reference character 10. Motor 10 comprises a casinggll which is of the totally enclosed type and which is provided with a bearing 12 in its front wall. A rear bearing 13 is carried by an intermediate partition 14 in casing 11 and supported in the bearings12 and 13 is'the rotatable motor shaftY 15 upon which is mounted the armature 16. Thestationary field 17 of the 11A and is connected as is'the armature 16, to the electrical leads which come into the casing` 11 from the handle 7. v,

Positioned upon the motorshaft 15 immediately forward of the casing 11 and within the fan chamber 3A is the suction-creating fan 18 which is tirredly mounted upon the shaft 15 and rotates therewith and functions to draw air, inthe operation of the machine,

through the suction nozzle 2 into the fan chamber 3, andy exhaust same into the space between the outer casing 4 and the motor casing 11. The air is forced rearwardly i'n of the motor casing and extends between said casing andthe enclosing casing 4. This support or bushing'comprises a hollow bolt,

y which is indicated generally by the reference character 20. Bolt 20 is rovided with a head 21 and a hollow bo y portion 22 which extends inwardly through the circu-l lar opening 23 provided in the enclosing casing 4. The inner end of body 22 of bolt 2O is threaded as at 23 and seats within a hollow bushing 24 which is internally threaded and which is mounted within the opening 25 in the motor casing 11. Bushing 24 is spaced from the casing wall by three circular sound-deadening rings 26, 27 and 28 made of bre or similar material which are positionedv immediately adjacent the edges of the motor casing wall surrounding the opening 2,5 'to prevent any looseness or noise in the bushing 24. An outer metallic plate 29 is positioned immediately adjacent the outer gasket 28 and is clamped therea-gainst as bythe speem'ng over of the outer end 30 of the bushing 24. The threaded end 23 of bolt 20 seats in screw-threaded relation "within the bushing 24 and serves to draw the motor casing 11 to the enclosing casing 4 and compresses therebetween the sounddeadening bushing 31 which encloses the body portion 22 ofthe bolt 20. vThe presence ofbushing 31 serves also to provide a support for the motor casing and substantiall eliminatesnoise resulting from vibratlon. Additional supporting means of any desired type may be employed to securely .position the motor 10. The entire supportmg construction described is simple and provides an'opening for the motor to the clean air .outside the enclosing vcasing 4.

In the' forward wall of the motor casing 11 immediately in the rear of the suctioncreating fan 18 are positioned a plurality ofl openings, of which one is indicated at 32 in Fig. 1, which connect the interior of motor casing 11 with the fan chamber 3. Positione upon the back of the main suctioncreating fan 18 is an auxiliary fan comprising blades 33, 33 which are suitably secured as by rivets 34. The auxiliary fan serves,

4in the operation of the machine when the main fan 18 is rotated, to create a negative pressure immediatelysurrounding the bear- .ings 12 which functions to draw the air from within the motor casing 11 through the openings 32 into the'fanhchamber .3 from which point it is forced by the auxiliary f an blades 33`to the exterior periphery of the fan 18 where it is carriedl the length of the motor along in the main air stream into the dirt separator 5.

The air which may be drawn through'the motor of the suction cleaner in the manner aforedescribed, is determined by the size of the opening in the motor support 2O and the openings 32 in the motor casing at the fan chamber end. The capacity of the auxiliary fan is also an element in the determination of the amount of air which is drawn therethrough and these variables may be so re.- lated that suiicient cooling air traverses the motor to maintain the desired temperature therein.

Having clearly set forth and described my invention, I claim:

1. In a suction cleaner a main casing including a nozzle, a fan chamber and a discharge passageway, an enclosed motor including a casing positioned in said discharge passageway and sound-deadening means to support said motor comprising a metallic bushing positioned in the wallof said motor casing and spaced therefrom by s/ound-deadening material, a metallic bolt extending through said main casing into said bushing in screw threaded relation and serving to draw said casings together and a bushing of motor casing withl the atmosphere surrounding the main casing, the forward wall of said motor casing defining a side of said fan chamber, saidwall having an .opening therein, a

motor in said motor casing having a shaft extended thru another opening in said wall into said fan chamber, a suction-creating fan in sai dv fan chamber mounted on the extended end of said shaft and adapt-edto draw air thru said nozzle and exhaust itin said discharge passageway, auxiliary ,fan blades on said fan adjacent said motor casing adapted to draw air from said motor casing thru said first opening in said motor casing wall and exhaust it into said discharge passageway.

3. In a suctlon cleaner, a mam caslng 1ncludinga nozzle, a fan chamber and a discharge passageway, a motor casing positioned in said discharge passageway, a motor in said casing, .a hollow support positioning said motor casing in said discharge passageway and interiorly connected to said motor casing and to the atmosphere surrounding said main casing, and means to draw cooling air for said motor from the atmosphere through said support into said motor casing.

Signed at North Canton, in the county of Stark, and State of Ohio, this 30th day of v April, A. D. 1930.

A WUJLIAM H. KITTO. 

